P1152 Code - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2
Quick Answer
The Heated Oxygen Sensor (HO2S) Monitor is an on-board strategy designed to monitor the HO2S sensors for a malfunction or deterioration that can affect emissions. Common causes include Faulty Upstream Oxygen Sensor Bank 2, Fuel pressure high or low, MAF sensor dirty/defective. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1152 indicates Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2.
- Common causes
- Common causes include Faulty Upstream Oxygen Sensor Bank 2, Fuel pressure high or low, MAF sensor dirty/defective.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1152 Description
• The HO2S sensor senses the oxygen content in the exhaust flow and outputs a voltage between zero and 1.0 volt. Lean of stoichiometric (air/fuel ratio of approximately 14.7:1 for gasoline engines), the HO2S will generate a voltage between zero and 0.45 volt. Rich of stoichiometric, the HO2S will generate a voltage between 0.45 and 1.0 volt.
• The HO2S Monitor evaluates both the upstream (Fuel Control) and downstream (Catalyst Monitor) HO2S for proper function.
• Once the HO2S Monitor is enabled, the upstream HO2S signal voltage amplitude and response frequency are checked. Excessive voltage is determined by comparing the HO2S signal voltage to a maximum calibratable threshold voltage.
• A fixed frequency closed loop fuel control routine is executed and the upstream HO2S voltage amplitude and output response frequency are observed. A sample of the upstream HO2S signal is evaluated to determine if the sensor is capable of switching or has a slow response rate.
• An HO2S heater circuit fault is determined by turning the heater on and off and looking for a corresponding change in the OSM and by
measuring the current going through the heater circuit.
• The MIL is activated after a fault is detected on two consecutive OBD II drive cycles.
What are the Possible Causes of the DTC P1152?
- Faulty Upstream Oxygen Sensor Bank 2
- Fuel pressure high or low
- MAF sensor dirty/defective
- Vacuum leak on engine
- Leaking fuel injector or fuel pressure regulator
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1152?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1152 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P1152 Audi — Bank 1 Long Term Fuel Trim Range 2 Lean Lower Limit Exceeded
- P1152 BMW — O2 Sensor Heater Circuit Low Voltage Bank 2 Sensor 1
- P1152 Chrysler — Fuel Rail Pressure Malfunction Positive Deviation Fuel Pressure Solenoid Setpoint
- P1152 Dodge — Fuel Rail Pressure Malfunction Positive Deviation Fuel Pressure Solenoid Setpoint
- P1152 Ford — Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2
- P1152 Hyundai — Accelerator Position Circuit Low Input
- P1152 Jeep — Fuel Rail Pressure Malfunction Positive Deviation Fuel Pressure Solenoid Setpoint
- P1152 KIA — Accelerator Position Circuit Low Input
- P1152 Lincoln — Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2
- P1152 Mazda — HO2S-21 Rich Condition Correcting For Over Lean Condition
- P1152 Mercury — Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Rich Bank 2
- P1152 MINI — O2 Sensor Heater Circuit Low Voltage Bank 2 Sensor 1
- P1152 Subaru — HO2S11 Sensor Circuit Range/Performance Low
- P1152 Suzuki — HO2S21 Circuit Shorted To Heater Power Supply
- P1152 Volkswagen — Bank 1 Long Term Fuel Trim Range 2 Lean Lower Limit Exceeded
Frequently Asked Questions about P1152 Code
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